JPH07334202A - Microcomputer device for control - Google Patents

Abstract

(57) [Summary] [Structure] The maintenance tool 7 appropriately divides an application program to be changed and sequentially executes maintenance requests, and outputs a memory switching signal when all maintenance requests are completed. The main controller 2 processes and executes a control operation by an application program stored in one of the application memories, and sequentially takes in the divided application programs to be changed according to a maintenance request from a maintenance tool, and the other application program memory. Sequentially store in. The switching unit 23 switches to execute the control operation by the changing application program stored in the other application program memory in response to the memory switching signal, and switches to store the changing application program in one application program memory. [Effect] Maintenance can be performed without stopping the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control microcomputer device.

[0002]

2. Description of the Related Art Conventionally, there has been known a control microcomputer device for performing process control by repeatedly executing input / output processing of process data and arithmetic processing by an application program.

In such a control microcomputer device, application programs are continuously stored in the application program storage memory, and the control device stores the application programs stored in the application program storage memory in the memory. The arithmetic processing is executed by sequentially analyzing and executing in the order shown.

Generally, an application program inside the control microcomputer device has a large capacity, and when changing the application program, a maintenance tool is connected to the control device to change the contents of the memory for storing the application program. .

FIG. 5 is a block diagram of this type of control microcomputer device.

The control microcomputer device 1 comprises a main control unit 2 and an application memory 3, and the main control unit 2 is connected to an external process input / output device 4 through a process input signal line 5 and a process output signal line. 6, and the maintenance tool 7 and the maintenance signal line 8 are connected.

The main controller 2 is connected to the application memory 3 by an address signal line 9, and the main controller 2 is connected to the application memory 3 by a data signal line 10. The read / write signal line 18 is connected between the main controller 2 and the application memory 3.

First, the main control unit 2 inputs a process input signal from the process input / output device 4 through the process input signal line 5 according to the processing procedure shown in FIG. Based on, the calculation by the application program is started (101, 10
2).

At this time, the main controller 2 sequentially outputs the address signals A0 to An-1 via the address signal line 9 to the application memory 3 for access. As a result, the main control unit 2 takes in the application program used for process control via the data signal line 10 and executes the sequential calculation.

When the main control unit 2 executes the calculation by all the application programs stored in the application memory 3, it outputs the process output signal from the process output signal line 6 to the process input / output device 4 (1
03). After that, the maintenance tool 7 and the maintenance signal line 8 interact with each other, and the process proceeds to the next process (104).

On the other hand, the control microcomputer device has been duplicated in the related art, and the process control is performed by repeatedly executing the process data input / output process and the application program arithmetic process while synchronizing the timing between the duplicated devices. There is known a microcomputer device for synchronous dual control which performs the above.

In such a control microcomputer device, application programs for performing arithmetic processing in both system devices must be the same in order to always execute the same operation. Therefore, when changing the application program in the control device, it is necessary to change both system control devices to the same application program at the same timing.

FIG. 7 is a block diagram showing an example of the above-mentioned synchronously duplicated control microcomputer device.

In the figure, the duplicated control microcomputer devices 1a and 1b are provided with main control units 2a and 2b having the same structure, respectively, and further provided with application memories 3a and 3b having the same structure, respectively. Between these, the address signal lines 9a and 9b and the data signal line 1
They are connected by 0a and 10b.

The main control units 2a and 2b are connected to one process input / output device 4 by process input signal lines 5a and 5b, respectively, and process output signal lines 6a and 6b.
The main control unit 2a is connected by the maintenance tool 7 and the maintenance signal line 8. The main control units 2a, 2b and the application memories 3a, 3b are connected by read / write signal lines 18a, 18b.

Data exchange signal transmission control units 11a and 11b and data exchange signal reception control units 12a and 12b are arranged between the main control unit 2a and the main control unit 2b, and these are data exchange output signal lines. Data exchange input signal lines 14a and 14b are connected to 13a and 13b, and data exchange signal lines 15a and 15b are connected to each other.

First, in the duplicated control microcomputer devices 1a and 1b, the main control units 2a and 2b have the data exchange signal transmission control unit 11 according to the processing procedure shown in FIG.
Data exchange output signal lines 13a, 1 for a, 11b
A data exchange output signal (dummy: meaningless signal) is output via 3b.

The data exchange signal transmission control units 11a and 11b which detect the data exchange output signal are connected to the data exchange signal line 1
Data exchange signals are mutually output to the control microcomputer device of the partner system via 5a and 15b (2
01a, 201b).

The data exchange signal reception control units 12a and 12b, which have detected the data exchange signal, exchange data to the main control units 2a and 2b via the data exchange input signal lines 14a and 14b to the effect that the data exchange signal has been detected. The input signal is output (202a, 202b).

Main control unit 2 which outputs a data exchange output signal
a and 2b are microcomputer devices 1 for controlling the partner system
The data exchange input signal originating from a and 1b is detected. As a result, the main control units 2a and 2b are assumed to be synchronized for data input from the process input / output device 4,
Process input signals are synchronously input via the process input signal lines 5a and 5b (203a and 203b).

After the input of the process input signal is completed, the main control units 2a and 2b execute arithmetic processing by the application program according to the process input signal (204).
a, 204b).

The application program of the control microcomputer device 1a is stored in the application memory 3a, and the application program of the control microcomputer device 1b is stored in the application memory 3b.

Each of the main control units 2a and 2b accesses the application memory 3a or the application memory 3b and executes the same operation in both duplex systems.

The main control units 2a and 2b which have performed the same arithmetic processing by the application program have the data exchange signal transmission control units 11a and 11b and the data exchange signal reception control unit 12 similarly to when the process input signal is input.
a, 12b, etc. are used to execute a synchronous process for outputting data to the process input / output device 4 (205a,
206a, 205b, 206b).

The synchronized main control units 2a and 2b for outputting data to the process input / output device 4 output process signals to the process input / output device 4 via the process output signal lines 6a and 6b (207a, 207a, 207b).

Subsequently, the main control units 2a and 2b, which have finished inputting the process input signal to the process input / output device 4, calculation by the application program, and output of the process output signal, pass through the maintenance signal line 8 from the maintenance tool 7. Interactive processing (208a, 208b). The above process is repeated.

[0027]

However, in the control microcomputer device 1 shown in FIG. 5, when the application program in the device is changed, the process control itself of the device is once stopped and then There is a problem in that the application program is changed and the control is restarted again, which causes a function stop state of the entire control system.

That is, while the control microcomputer device 1 is executing the process control, the calculation by the application program is repeatedly executed at high speed. Therefore, in order to change the application program without affecting the process control cycle of the device,
It is desirable to divide the changed application program information into smaller pieces by using the maintenance tool 7 and store them in the application memory 3 of the apparatus.

However, if the application programs before and after the change are mixed in the application program memory 3, the intended operation may not be performed, and there is a possibility that an erroneous operation and an erroneous output may be performed as the device.

In order to avoid this state, when the application program of the control microcomputer device 1 is changed, it is necessary to write all the changed application program information in the memory all at once.
A lot of processing time is required for this batch writing, and the arithmetic function of the control microcomputer device 1 must be stopped during the processing time.

Therefore, when the application program in the control microcomputer device 1 is changed, the process control is temporarily stopped, and then the maintenance tool 7 stores it in the application program memory 3 of the control device. All the changed application program information is written, and the process control is restarted when all the writing is completed.

Further, the synchronous duplex control microcomputer apparatuses 1a and 1b shown in FIG. 7 execute synchronous duplex control when the application program is changed in order to execute the same application program in both duplex systems. After degrading the operating control unit to single operation with one system stopped, connect a maintenance tool to each control unit, change the application program in each control unit, and restore to synchronous dual operation. Was there.

That is, when changing the application program, first, one of the devices is brought into the control stop state, and then the stopped application program in the control device is rewritten with the changed application program.

Next, after the other device is also brought into the control stop state, it is first stopped and the control of the device for which the rewriting of the application program is completed is restarted, and subsequently the application program of the stopped control device is changed. After rewriting to the application program later, the control is restarted and the operation is returned to the duplex operation.

There is a problem in that a lot of time is spent for this operation and there is a possibility of causing an erroneous operation, which lowers the operating rate and reliability of the system.

Therefore, an object of the present invention is to provide a control microcomputer device capable of changing an application program without stopping the control function.

[0037]

According to the present invention, a process input / output device of a plant fetched from a process input / output device is subjected to control calculation according to an application program and the control signal is used as a process output signal. When there is a maintenance request for changing the application program from the outside while outputting to the plant via the, the control microcomputer device that executes the maintenance processing of the application program appropriately divides the application program to be changed and sequentially requests the maintenance request. A maintenance tool that executes and outputs a memory switching signal when the maintenance request for all the changed application programs is completed, two application program memories for storing the application programs, and these application programs. Application program memory stored in one of the application programs, the control program is processed and executed, and the changed application programs divided by the maintenance request from the maintenance tool are sequentially fetched and stored in the other application program memory. A main control unit and a switching means for switching to execute a control operation by an application program stored in the other application program memory by a memory switching signal, and for switching to store an application program to be changed in one application program memory; Is provided.

According to the second aspect of the invention, the process input signal of the plant taken in from the process input / output device is subjected to control calculation according to the application program, and the control signal is output as a process output signal to the plant via the process input / output device. In addition, when there is a maintenance request to change the application program from the outside, the two main control units that execute the maintenance process of the application program and the process by the control calculation and the maintenance process corresponding to these main control units are synchronized. In a duplicated control microcomputer device having a data exchange signal transmission control unit for transmitting a data exchange signal for execution and a data exchange signal reception control unit for receiving a data exchange signal, an application program to be changed is appropriately divided. And perform maintenance requests sequentially, When a maintenance request for an application program to be changed by a unit is completed, a maintenance tool that outputs a memory switching signal, two application program memories that store the application program and are provided corresponding to the main control units, and the main control units are provided. A means for sequentially storing, in the other application memory, the application programs to be changed, which are divided by the maintenance request, when mutually exchanging the provided data exchange signals and executing the control operation using the application program of the one application memory. , One of the application program memories is switched to execute the control operation by the application program stored in the other application memory by the memory switching signal provided corresponding to the main control unit. Switch to store an application program that changes is obtained so as to have a switching means.

According to a third aspect of the present invention, in the control microcomputer device according to the first or second aspect, the switching means sets O for each input of the pulsed memory switching signal.
A flip-flop circuit that outputs an application memory switching signal by alternately inverting the N signal and the OFF signal;
An exclusive OR circuit that outputs the selection signal by taking the exclusive OR of the application memory switching signal and the maintenance request signal from the main control unit, and the logical product of the selection signal and the application memory access signal from the main control unit One AN that outputs one application memory selection signal so as to switch to one application memory when
The D gate circuit and the other AND gate circuit which outputs the other application memory selection signal so as to switch to the other application memory when the logical product of the signal obtained by inverting the selection signal by the NOT circuit and the application memory access signal is established. It is provided.

[0040]

According to the first aspect of the present invention, when the control operation is executed using the application program of one application memory, the application program to be changed is divided and sequentially stored in the other application memory, and the memory is switched. The application program executed by the signal can be switched to a new application program memory. Therefore, it is possible to switch to a new application program memory without affecting the control cycle and the arithmetic control. Therefore, the maintenance work of the application program can be performed without stopping the control microcomputer device in operation for maintenance, the system operation rate and reliability are improved, and the maintenance work is simplified.

According to the second aspect of the present invention, when the control operation is executed by using the application program in one of the application memories, the application program to be changed is divided and sequentially stored in one of the other application memories, The application program to be executed can be switched to a new application program by the memory switching signal. As a result, it is possible to switch the application program executed by the microcomputer for controlling both systems to a newly changed application program without stopping the control of the microcomputer for controlling both systems. Therefore, it is possible to perform application program maintenance work without having to perform single operation or complete stoppage of both system devices for maintenance as in the past, improving system operation rate and reliability and simplifying maintenance work. To be done.

[0042]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a control microcomputer device showing a first embodiment of the present invention.

FIG. 1 shows a conventional example, and the same reference numerals as those in FIG. 5 indicate the same or corresponding portions. In FIG. One of the two is allocated as the area of the application program used for process control, the other is allocated to the area of the new application program to be maintained, and after the new application program is written in the area of the other application program, the other is switched. A switching means 23 is provided.

In the control microcomputer device 1, the address signal line 9 to the application memory 3 is extended and the application memory 2 is used as the address signal line 21.
0, the data signal line 22 is newly connected from the application memory 20 to the data signal line 10 from the application memory 3, and the application memory 3 and the application memory 20 are connected in parallel to the main control unit 2. There is.

The switching means 23 includes a JK flip-flop circuit 24, an XOR gate circuit 25, and an AND gate circuit 26.
And an AND gate circuit 27 and a NOT gate circuit 28.

That is, the JK flip-flop circuit 24
Is connected to the input side of the memory switching command signal line 30 from the main control unit 2, and from the output side of the memory switching signal line 31.
Are connected to one input side of the XOR gate circuit 25.

Further, the other input side of the XOR gate circuit 25 is connected to a maintenance input signal line 32 for a maintenance request from the main control unit 2, and an output signal line 33 of the XOR gate circuit 25 is an AND gate. Circuit 26 and NOT gate circuit 2
8 are connected to AND gate circuits 27, respectively.

On the other hand, an application memory access signal line 34 is connected from the main controller 2 to the AND gate circuit 26 and the AND gate circuit 27. On the output side, the application memory selection signal line 35 is connected to the application memory 3 and the application memory selection signal line 36 is connected to the application memory 20. Further, read / write signal lines 18 and 19 for reading / writing the memory are provided with the main controller 2, the application memory 3, and the application memory 2.
It is provided between 0 and.

With the above configuration, the process will be described with reference to the processing procedure shown in FIG.
A process signal is input via the process input signal line 5 from the input terminal, and when the input of the process input signal is completed, the arithmetic processing by the application program is performed using the process input signal (301).

Here, the application program of the control microcomputer device 1 is stored in either the application memory 3 or the application memory 20, and the main control section 2 uses the application memory 3 or the application storing the application program. By accessing the memory 20 in the following procedure, an application program is obtained and necessary calculations are performed (302).

First, the main control section 2 outputs a signal indicating that the application memory 3 and the application memory 20 are to be accessed through the application memory access signal line 34, and obtains an application program used for process control. Then, the signal that is the signal An “0” is output via the maintenance signal line 32.

On the other hand, the signal of the application memory switching command signal line 30 is "0", and the application memory switching signal line 31 which is the output signal of the JK flip-flop circuit 24 takes the value of "1". There is. In this state, the XOR gate circuit 25, to which the application memory switching signal line 31 of the JK flip-flop circuit 24 and the signal An in the maintenance signal line 32 output from the main control unit 2 are input, XORs the two input signals. The resulting signal “1” is output to the output signal line 33.

The signal "1" on the output signal line 33, together with the signal "1" on the application memory access signal line 34 output from the main control unit 2, is combined with the AND gate circuit 2
6 is input. In the AND gate circuit 26, the signal “1” obtained by ANDing the two input signals “1” is output to the application memory 3 as the application memory selection signal line 35.

As a result, the application memory 3 which has detected the signal "1" on the application memory selection signal line 35 changes its address from the address signal A0 to the signal An-1 through the address signal line 9 as its own memory is selected. The data in the own memory selected by the data signal line 10
Output from.

The main control unit 2 includes an application memory 3
The main control unit 2 inputs the data extracted from the data signal line 10. As a result, the main control unit 2 can obtain one piece of information of the application program used for process control.

After that, the main control section 2 sequentially updates the address signals output by itself by the same operation as described above, thereby executing all calculations for process control while obtaining all application program information. .

By such a procedure, the calculation is executed by all the application programs stored in the application memory 3. After that, the main controller 2 outputs a process output signal via the process output signal line 6 to the process input / output device 4 (303).

Next, when the input and calculation of the signal of the process input signal line 5 to the process input / output device 4 and the output of the signal of the process output signal line 6 are completed, the main control section 2
Next, a signal is searched for through the maintenance signal line 8 from the maintenance tool 7 (304).

At this time, if the maintenance tool 7 indicates effective maintenance information for changing and maintaining the application program through the maintenance signal line 8, the main control unit 2 uses the maintenance information in the following procedure. Application memory 2
Save to 0.

First, in the main controller 2, when an effective maintenance signal for application program change maintenance is input from the maintenance tool 7, the signal on the maintenance signal line 34 is set to "1".
At the same time, the address signal with the signal An = “1” and the application program information to be maintained are output from the data signal line 10.

On the other hand, the signal on the application memory switching signal line 31, which is the output side of the JK flip-flop circuit 24, takes the value of "1". The signal "1" of the application memory switching signal line 31 and the input signal line 32
The XOR gate circuit 25 to which the two signals of the address signal An = “1” are input outputs the signal “0”.

The NOT gate circuit 28 inverts the input signal to "1", and the inverted signal and the signal via the application memory access signal line 34 are input to the AND gate circuit 27, and in the AND gate circuit 27. A signal "1" is output to the application memory 20 via the application memory selection signal line 36 (305).

The application memory 20 judges that its own memory has been selected, and within the own memory selected corresponding to the address signals A0 to An-1 via the address signal line 21 of the main control unit 2. Then, maintenance information, that is, an application program to be changed is written from the main control unit 2 through the data signal line 22 (306).

The main control section 2 sequentially updates the address signal and the data signal output by itself by the same operation, so that all the application programs to be changed input from the maintenance tool 7 are updated in the application memory 2.
Store in 0.

The main control unit 2 speeds up the process of inputting signals from the process input / output device 4 from the process input signal line 5, calculation, output to the process output signal line 6 and maintenance signals from the maintenance tool 7. Execute repeatedly. At this time, the information for changing and maintaining the application program from the maintenance tool 7 is divided into small amounts and output to the main control unit 2 so as not to affect the control cycle of the main control unit 2. The unit 2 sequentially stores application programs, which are output from the maintenance tool 7 in a divided manner for each control cycle, in the application memory 20.

When all the application programs have been saved in the application memory 20 by repeating the above processing, the maintenance tool 7 then outputs a memory switching signal.

Main control unit 2 to which this memory switching signal is input
Outputs a signal "1" to the application memory switching command signal line 30, and the signal of the application memory switching signal line 31 from the JK flip-flop circuit 24 to which this application memory switching command signal is input is the input of the application memory switching signal. Previous "1" to "0"
Flip to.

As a result, the XOR gate circuit 25 to which the signal of the application memory switching signal line 31 and the signal An "0" of the maintenance signal line 32 output by the main control unit 2 are input.
The output of is inverted from the previous state and becomes "0". Therefore, the signal “1” is ANDed via the NOT gate circuit 28.
The signal “1” is input to the gate circuit 27 and is input to the AND gate circuit 27 via the application memory access signal line 34. Along with this, the control microcomputer device 1 switches to the application memory 20 which stores the newly changed and maintained application program output from the maintenance tool 7.

As a result, this time, the main control unit 2 retrieves the newly changed application program from the application memory 20 and performs the operation.

On the contrary, when there is a maintenance request, the main control unit 2
Outputs the signal “1” from the AND gate circuit 26 to the application memory 3 as the signal An = “1”, switches to the application memory 3, and stores the application program in the application memory 3 via the data signal line 10.

As described above, the control microcomputer device 1 is divided from the maintenance tool 7 while the application program executed by the control microcomputer device 1 is not affected by the control cycle and arithmetic control of the control microcomputer device 1. In addition to being able to store the data in No. 1, the application program executed by the control microcomputer device 1 can be switched to a new application program in an instant by the memory switching signal.

As a result, the maintenance work of the application program can be performed without stopping the control microcomputer device 1 in operation for maintenance, the system operation rate and reliability are improved, and the maintenance work is simple. Be converted.

FIG. 3 is a block diagram of a control microcomputer device showing a second embodiment of the present invention, and the same reference numerals as in FIG. 7 showing a conventional example indicate the same or corresponding portions.

FIG. 3 shows that the control microcomputer devices 1a and 1b are provided with application memory 3a,
Application memories 20a, 20 having the same configuration as 3b
b is newly provided while the application memory 3a,
3b or one of the application memories 20a and 20b is used as an application area for process control, the other is allocated to an area of an application program to be changed to be maintained, and a new application program is written in the other area, and then Switching means 23a and 23b for switching the other are provided.

Control microcomputer devices 1a, 1
In b, the address signal lines 9a and 9b to the application memories 3a and 3b are extended and the address signal lines 21a and 2b are provided.
1b is connected to the application memories 20a and 20b, and new data signal lines 22a and 22b from the application memories 20a and 20b are connected to the data signal lines 10a and 10b from the application memories 3a and 3b to the main control units 2a and 2b. In contrast, the application memories 3a and 3b and the application memories 20a and 20
b and b are connected in parallel. Then, the read / write signal lines 19a, 19 extending from the read / write signal lines 18a, 18b
b is connected to the application memories 20a and 20b.

The switching means 23a and 23b are composed of the JK flip-flop circuits 24a and 24b and the XOR gate circuit 25.
a and 25b and AND gate circuits 26a and 26b and AND
The gate circuits 27a and 27b and the NOT gate circuit 28a,
And 28b.

That is, the JK flip-flop circuit 24
Application memory switching command signal lines 30a and 30b from the main control units 2a and 2b are connected to a and 24b, and the application memory switching signal line 31 is connected from the output side.
a and 31b are connected to one input side of the XOR gate circuits 25a and 25b.

The maintenance signal lines 32a and 32b are connected to the other input side of the XOR gate circuits 25a and 25b, and the output signal line 33 of the XOR gate circuits 25a and 25b.
a and 33b are AND gate circuits 26a and 26b and NOT
AND gate circuit 2 via gate circuits 28a and 28b
7a and 27b, respectively.

On the other hand, the main control units 2a, 2 are connected to the AND gate circuits 26a, 26b and the AND gate circuits 27a, 27b.
b to the application memory access signal line 34a,
34b is connected. On the output side, application memory selection signal lines 35a and 35b are connected to the application memories 3a and 3b, respectively, and application memory selection signal lines 36a and 36b are connected to the application memories 20a and 20b.

First, in the duplicated control microcomputer devices 1a and 1b, the main control units 2a and 2b have the data exchange signal transmission control unit 11 according to the processing procedure shown in FIG.
Data exchange output signal lines 13a, 1 for a, 11b
A data exchange output signal (dummy: meaningless signal) is output via 3b.

The data exchange signal transmission control units 11a and 11b, which have detected the data exchange output signal, operate on the data exchange signal line 1
The data exchange signals are mutually output via 5a and 15b to the control microcomputer device of the partner system in the synchronous double operation (401a and 401b).

The data exchange signal reception control units 12a and 12b that have detected the data exchange signal exchange data to the main control units 2a and 2b via the data exchange input signal lines 14a and 14b to the effect that the data exchange signal has been detected. The input signal is output (402a, 402b).

Main control unit 2 which outputs a data exchange output signal
a and 2b detect a data exchange input signal originating from the control microcomputer devices 1a and 1b of the partner system. As a result, the main control units 2a and 2b synchronously input the process input signal from the process input / output device 4 via the process input signal lines 5a and 5b (403a and 403).
b).

Here, first, the application program for performing control calculation by the control microcomputer device 1a is stored in the application memory 3a by the switching means 23a, and the application program to be changed is stored in the application memory 20a. ing. Further, the application program which is controlled and operated by the control microcomputer device 1b is stored in the application memory 3b by the switching means 23b, and the application program to be changed is stored in the application memory 20b.

Each of the main control units 2a and 2b first executes the same operation in both duplex systems using the application programs in the application memories 3a and 3b (4
04a, 404b).

When the calculation is completed, the main control units 2a, 2b
Performs a synchronization process for outputting data to the process input / output device 4 by using the data exchange signal transmission control units 11a and 11b and the data exchange signal reception control units 12a and 12b (405a, 406a, 405b, 40).
6b).

The synchronized main control units 2a and 2b for outputting data to the process input / output device 4 output process signals via the process output signal lines 6a and 6b to the process input / output device 4 (407a, 407
b). At this time, when the two process signals match, the process signal is output to the plant, and when they do not match, the process signal is not output.

Next, the maintenance signal from the maintenance tool 7 is searched.

In this search, if the maintenance signal indicates the effective maintenance information for the application program maintenance, the main control unit 2a internally stores the presence of the maintenance information and the data exchange signal transmission control unit 11a and the data. It is transmitted to the main control unit 2b via the exchange signal reception control unit 12b to internally store the presence of maintenance information. Then, the main control unit 2b transmits to the main control unit 2a via the data exchange signal transmission control unit 11b and the data exchange signal reception control unit 12a that the maintenance information is stored internally (408a, 408b, 40).
9a, 409b, 410a, 410b, 411a, 41
1b).

Next, in the main controller 2a, when a valid maintenance signal for application program change maintenance is input from the maintenance tool 7, the signal on the maintenance signal line 34a is set to "1" and the signal An = "". The address signal of "1" and the application program information to be maintained are output from the data signal line 10a.

At this time, the JK flip-flop circuit 24
Application memo switching signal line 31 which is the output side of a
The signal a has a value of "1". Therefore, the signal "1" is sent through the application memory selection signal line 36a.
Is output to the application memory 20a (411
a, 412a).

The application memory 20a receives the address signal A via the address signal line 21a of the main controller 2a.
The maintenance information selected corresponding to the signals 0 to An-1, that is, the application program to be changed is written.

On the other hand, the main controller 2a transmits maintenance information to the main controller 2b via the data exchange signal transmission controller 11a and the data exchange signal reception controller 12b. Then, the main control unit 2b transmits the fact that the maintenance information has been received to the main control unit 2a via the data exchange signal transmission control unit 11b and the data exchange signal reception control unit 12a.

In the main controller 2b, when a valid maintenance signal for application program change maintenance is input from the main controller 2a, the signal on the maintenance signal line 34b is set to "1" and the signal An = "1". The address signal and the application program information to be maintained are output from the data signal line 10b.

At this time, since the signal on the application memo switching signal line 31b has a value of "1", the signal "1" is output to the application memory 20b via the application memory selection signal line 36b (412).
b).

The application memory 20b receives the address signal A via the address signal line 21b of the main controller 2b.
The changing application program selected corresponding to signals 0 to An-1 is written.

The main control section 2a and the main control section 2b are used to input and calculate signals from the process input signal line 5 from the process input / output device 4, output them to the process output signal line 6, and perform maintenance from the maintenance tool 7. The processing for the signal is repeatedly executed at high speed.

At this time, the information for changing and maintaining the application program from the maintenance tool 7 is displayed by the main control unit 2.
a so as not to affect the control cycle of the main controller 2b,
The data is divided into small amounts and output to the main control unit 2a. The main control unit 2a sequentially stores application programs, which are output from the maintenance tool 7 in each control cycle, in the application memory 20a. Control unit 2a
Transmits maintenance information to the main control unit 2b via the data exchange signal transmission control unit 11a and the data exchange signal reception control unit 12b. Then, the main control unit 2b transmits the fact that the maintenance information has been received to the main control unit 2a via the data exchange signal transmission control unit 11b and the data exchange signal reception control unit 12a. As a result, application programs that are repeatedly divided and sent are sequentially stored in the application memory 20b.

By repeating the above processing, all the application programs are loaded into the application memory 20a,
When the storage in 20b is completed, the maintenance tool 7 then outputs a memory switching signal to the main controller 2a.

Main control section 2 to which this memory switching signal is input
The a transmits the maintenance signal presence information and the information indicating that it is a memory switching signal to the main control unit 2b using the data exchange signal transmission control unit 11a and the data exchange signal reception control unit 12b. Thereby, the application memory selection signal lines 35a, 35b, 36a, 3 from the switching means 23a, 23b.
A memory selection signal is output to 6b, and application memories 3a and 3b and application memories 20a and 20
It is switched to b.

As described above, according to the control microcomputer device of the second embodiment, the maintenance information from the maintenance tool connected to either one of the control microcomputer devices in the synchronous double operation is used for controlling both systems. The maintenance information of the application programs of two control microcomputer devices during synchronous double operation is updated at the same time by sharing them with the microcomputer device, and the control of both system control microcomputer devices is performed at the same time. It is possible to switch the application program executed by the microcomputer device for controlling both systems to a new application program without stopping the operation.

As a result, the application of the control microcomputer device during the synchronous double operation can be performed without performing the single operation for the maintenance of the control microcomputer device during the synchronous double operation or the complete stoppage of both system devices. Program maintenance work becomes possible and maintenance work is simplified.

In the description of the second embodiment of the present invention, the data exchange signal transmission / reception control unit for exchanging the maintenance information from the maintenance tool is also used for the timing synchronization before the process data input / output. However, it is also possible to separately provide a transmission / reception control unit for timing synchronization.

[0105]

As described above, according to the first aspect of the invention, when the control operation is executed using the application program of one application memory, the application program to be changed is divided and the other application is sequentially applied. It is possible to switch to a new application program that is stored in the memory and changes the application program to be executed by the memory switching signal. Therefore, without stopping the device for maintenance,
Maintenance work of application programs becomes possible,
The operation rate and reliability of the system are improved, and maintenance work is simplified.

According to the invention of claim 2, when the control operation is executed using the application program of one of the application memories, the application program to be changed is divided and sequentially stored in one of the other application memories, It is possible to switch to a new application program that changes the application program to be executed by the memory switching signal. Therefore,
Application program maintenance work can be performed without performing single operation or complete stoppage of both system devices for maintenance as in the past, improving system operation rate and reliability and simplifying maintenance work. .

[Brief description of drawings]

FIG. 1 is a configuration diagram of a control microcomputer device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of the control microcomputer device of FIG.

FIG. 3 is a configuration diagram of a control microcomputer device according to a second embodiment of the present invention.

4 is a flowchart showing a processing procedure of the control microcomputer device of FIG.

FIG. 5 is a configuration diagram of a control microcomputer device showing a first conventional example.

6 is a flowchart showing a processing procedure of the control microcomputer device of FIG.

FIG. 7 is a block diagram of a control microcomputer device showing a second conventional example.

8 is a flowchart showing a processing procedure of the control microcomputer device of FIG.

[Explanation of symbols]

 1a, 1b Control microcomputer device 2a, 2b Main control unit 3a, 3b Application memory 5a, 5b Process input signal line 6a, 6b Process output signal line 9a, 9b Address signal line 10a, 10b Data signal line 11a, 11b Data exchange Signal transmission control section 12a, 12b Data exchange signal reception control section 23a, 23b Switching means 24a, 24b JK flip-flop circuit 25a, 25b XOR gate circuit 26a, 26b, 27a, 27b AND gate circuit 28a, 28b NOT gate circuit

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area G06F 15/78 510 G

Claims (3)

[Claims] 1. A plant process input signal fetched from a process input / output device is subjected to a control operation according to an application program to output the control signal as a process output signal to the plant via the process input / output device, and an external device. When there is a maintenance request for changing the application program from the above, in the control microcomputer device for executing the maintenance processing of the application program, the application program to be changed is appropriately divided and the maintenance request is sequentially executed, and all the application programs to be changed Maintenance tool that outputs a memory switching signal when the maintenance request is completed, two application program memories for storing the application program, and these application program memories When performing the control operation by the application program stored in one of the application memory,
A main control unit that sequentially captures the divided application programs to be changed according to a maintenance request from the maintenance tool and stores them in the other application program memory, and an application program stored in the other application program memory by the memory switching signal. Switch to execute the control calculation by
A control microcomputer device comprising: a switching unit that switches to store an application program to be changed in one of the application program memories. 2. A plant process input signal taken in from a process input / output device is subjected to a control operation according to an application program to output the control signal as a process output signal to the plant via the process input / output device, and an external device. When there is a maintenance request to change the application program from the two, the two main control units that execute the maintenance process of the application program and the process by the control calculation and the maintenance process corresponding to these main control units are synchronously executed. In a duplicated control microcomputer device having a data exchange signal transmission control unit for transmitting a data exchange signal and a data exchange signal reception control unit for receiving the data exchange signal, the application program to be changed is appropriately divided. And perform maintenance requests sequentially, Maintenance tool for outputting a memory switching signal when the maintenance request of the application program to be changed is completed, two application program memories for storing the application program and corresponding to the main control section, and each of the main programs. When the data exchange signals provided in the control unit are exchanged with each other and the control operation is executed using the application program of one application memory, the divided application program to be changed by the maintenance request is transferred to the other application memory. And means for sequentially storing to the main control unit, and the memory switching signal provided corresponding to the main control unit switches to execute the control operation by the application program stored in the other application memory. A control microcomputer device having a switching means for switching so that an application program to be changed is stored in one of the application program memories. 3. The flip-flop circuit, wherein the switching means outputs an application memory switching signal by alternately inverting an ON signal and an OFF signal for each input of the memory switching signal, the application memory switching signal and the main control. An exclusive-OR circuit that outputs a selection signal by taking an exclusive-OR with a maintenance request signal from the control unit, and one of the above-mentioned ones due to the logical product of the selection signal and the application memory access signal from the main control unit. AND gate circuit that outputs one application memory selection signal so as to switch to the other application memory, and the other application by the logical product of the signal obtained by inverting the selection signal by the NOT circuit and the application memory access signal. The other application, like switching to memory 3. The control microcomputer device according to claim 1, further comprising another AND gate circuit that outputs a memory selection signal.